Bumper Assembly
βπDuckiebot DB17-lc parts.
Having the Duckiebot with configuration DB17-wjd assembled. The assembly process is explained in Unit E-3 - Assembling the Duckiebot DB17-wjdlc.
Time: about 15 minutes.
A Duckiebot with Bumpers (configuration DB17-l2)
Locate all required parts
βThe following should be included in your parts envelope (See image below for these components):
- 1x front bumper (Camera side)
- 1x rear bumper (the side of Caster/Omnidirectional wheel)
- 2x rear bumper brace (the side of Caster/Omnidirectional wheel)
- 8x M2.5x10 nylone or metall screws
- 8x M2.5 nuts
The following is not included in your parts envelope but will be needed for assembly:
- Small screwdriver
Reminder: Use care when assembling!
βπWhen assembling, be sure to be gentle! Tighten screws just enough so that the parts will remain stationary. When inserting LEDs, gently work them into their holders. While the acrylic is relatively tough, it can be fractured with modest force. We donβt have many replacements (at this moment) so we may not be able to replace a broken part.
Remove protective paper
βPeel protective layer off of all parts on all sides.
Assembly Rear Spacers
βDisassembly the spacers between the both chassis
βThe backside of duckiebot before assemblying the bumpers looks as Figure 4.4:
Now remove the spacers and the (short)metall screws from the standoffs (configuration βDB17-wjdβ) and replace it with 4 M3x10 nylon screws for connecting the chassis and the bumper spacers.
M3x10 screws attaching bottom rear brace:
Back View, fully assembled:
For the ETH students, the M3*10 nylon screws for attaching the rear spacers with chassis were already distributed during the duckiebot ceremony and not included in second distribution. Please reuse them!
Mount Rear Bumper
βCarefully guide rear bumper on to rear bumper brace tabs. Ensure that the hole for charging aligns with the charging port on your battery.
Locate 4 M2.5 nylon/metall nuts and 4 M2.5*10 nylon screws. Place a nut in the wide part of the t-slot and thread a screw into the nut as shown in the following pictures. Note Use care when assembling! If you are having trouble with the nuts falling out, take a small piece of transparent tape and place it over both sides of the t-slot with the nut inside. It wonβt look as nice but it will be much easier to assemble.
Test the screws and the nuts once by screwing them together before you use it for the bumpers. It make the fllowing assembly process much easier.
For ETH 2017, the screws and nuts using for this step are M2.5*10 nylon screws (white) and M2.5 nylon or metall nuts from the envelope.
The completed rear bumper should look like this:
Congrats! your rear bumper assembly is complete!
Mount Front Bumper
βThe front side of duckiebot in βDB17-wjdβ should look like in Figure 4.12
Take 2x M2.5*10 nylon screws and 2x M2.5 nylon nuts and install them as shown in the following pictures. The first picture shows the correct holes to mount these screws (The correct position is the widest pair of 3mm holes beside the camera). The nuts should tightened on by a few threads (these are the two nuts that are not yet tightened at the top of the second picture):
Before tighten the front bumper, you should organise the wires of LEDs going through the right holes of chassis. Take a look in Figure 5.4 The center LED should be bent at a right angle in the direction that the wire is fed through the body.
Take the front bumper and carefully press the LEDs into the flexure holders. Take care that the wires are routed behind the front bumper. Also note that the front center LED wire should not be crushed between the bumper and the right spacer (you will likely fracture the bumper if you try to force it). The center LED should be bent at a right angle in the direction that the wire is fed through the body (see Figure 4.13).
Position the bumper so that the nuts align with the t-slots. You may need to loosen or tigthen the screws to align the nuts. You may also need to angle the front bumper when inserting to get it past the camera screws.
Gently tighten the nuts. The front bumper should now stay in position.
Congrats! your bumper assembly is complete!